The levels of circulatory inflammatory markers, including
interleukin (IL) IL-1β,
IL-6,
tumor necrosis factor-α (TNF-α) and
interferon (INF-γ), are known to increase associated to aging.
Caffeine has been reported to produce many beneficial effects for health. Exercise is considered to be a safe medicine to attenuate
inflammation and cellular senescence. The purpose of the present study was to investigate the effects of a moderate-intensity swimming exercise (3 % of
body weight, 20 min per day, 4 weeks) and sub-chronic supplementation with
caffeine (30 mg/kg, 4 weeks) on the serum
cytokine levels in middle-aged (18 months) Wistar rats. The effects of swimming exercise and
caffeine on oxidative stress in muscle and liver of middle-aged rats were also investigated. The two-way ANOVA of pro-inflammatory
cytokine levels demonstrated a significant exercise x
caffeine interaction for IL-1β (F (1, 16) = 9.5772; p = 0.0069),
IL-6 (F (1, 16) = 8.0463; p = 0.0119) and INF-γ (F (1, 16) = 15.078; p = 0.0013). The two-way ANOVA of TNF-α levels revealed a significant exercise ×
caffeine interaction (F (1, 16) = 9.6881; p = 0.00670). Swimming exercise and
caffeine supplementation increased the ratio of
reduced glutathione/
oxidized glutathione in the rat liver and gastrocnemius muscle. Hepatic and renal markers of damage were not modified. In conclusion, a moderate-intensity swimming exercise protocol and
caffeine supplementation induced positive adaptations in modulating
cytokine levels without causing oxidative stress in muscle and liver of middle-aged rats.